CVE-2026-21728 HIGH

CVE-2026-21728: Tempo query limit results in unbounded memory allocation

Vendor Grafana
Product Tempo
Published April 24, 2026
Last update June 30, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

Tempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy. Mitigation can be done by setting max_result_limit in the search config, e.g. to 262144 (2^18).

Key dates

02Disclosure timeline

April 24, 2026 CVE published
June 30, 2026 Record updated